My server, which hosts Teamspeak, needs to be rebooted on Sunday 10th September during a 1 hour window starting 00:00 UTC / 01:00 BST / 02:00 CEST. The actual reboot should take (much) less than 20 minutes. Obviously TS will be unavailable while this occurs, but if you are using it at that time it should automatically reconnect when the server is back up.